Not able to join A server

I've been playing quite a while on one of WonderLands' servers now but I suddenly can't join it
5.135.189.29:27015 is the iphttp://prntscr.com/je91vb this is what it shows when i try to join.
I checked to see if I were banned and I'm not. I did try once to join with an alt to see if it was client problems but it wasn't, also all other servers still work.
So I'm really confused to what's wrong here

Oh nice, I found out I got banned for duplicate account. Now I’m really confused as to why.
It made me kinda sad as to me really enjoying the server. So having 2 computers, one where I play on and one where my little brother plays on can get me banned?

You were banned for cheat spam and tried to use second account to "bypass it" thus the reason duplicate account, anyways if you'd like to go further with this and appeal your ban then please do it in here: https://wonderland.tf/forums/appeals.14/